US Bridges

FM over Shell Rock River

Fair

Floyd County, Iowa · 095183602 · Structure no. 000000000155010

Built
1967
58 years old
Condition
Fair
inspected March 2023
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
345 ft
3 main spans
Daily traffic
118
2022 count
Owner
County
County Highway Agency

About this bridge

FM over Shell Rock River is a steel continuous stringer/multi-beam or girder carrying FM over Shell Rock River in Floyd County, Iowa. It was built in 1967, so it is 58 years old, older than the Iowa average of 45.5 years.

The most recent inspection reported to the Federal Highway Administration rates it in fair condition with a lowest component rating of 6 out of 9. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

It carries about 118 vehicles a day, projected to reach 118 by 2043. The structure is 345 ft (105.2 m) long and 30 ft wide. If it were closed, the detour would be 9.9 mi (16 km).

CarriesFM
CrossesShell Rock River
Location095183602
RouteCounty Highway 0
StateIowa
Coordinates43.00502, -92.92554
Functional classRural Local

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure7 GoodSome minor problems.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection7 GoodSome minor problems.
Last inspectionMarch 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating61.4 US tons
Inventory rating36.8 US tons

Structure

MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadH 20
Structure length345 ft (105.2 m)
Longest span133 ft (40.5 m)
Deck width30 ft (9.1 m)
Roadway width28 ft (8.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic118 (2022)
Projected traffic118 by 2043
Trucks0%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed9.9 mi (16 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedOther structural work, including hydraulic replacements
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was FM over Shell Rock River built?

It was built in 1967, making it 58 years old in 2025.

What condition is FM over Shell Rock River in?

The National Bridge Inventory rates it in fair condition. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound. The last reported inspection was in March 2023.

How much traffic does FM over Shell Rock River carry?

About 118 vehicles per day (2022 count).

How long is FM over Shell Rock River?

The structure is 345 ft (105.2 m) long with a longest span of 133 ft (40.5 m) and a deck 30 ft wide.

Who owns FM over Shell Rock River?

It is owned by the County Highway Agency.